ELASTIC BOUNDARY WAVE DEVICE

摘要

Disclosed is an elastic boundary wave device that allows an increase in the surge breakdown voltage. Provided is an elastic boundary wave device (1), in which a dielectric film (3), made from a first dielectric, is formed on the top surface (2a) of a piezoelectric substrate (2), electrodes (4), including IDT electrodes, are formed on the dielectric film (3), and a dielectric layer (15) made from a second dielectric is formed so as to cover the electrodes (4).